The Science Journal of the American Association for Respiratory Care

2011 OPEN FORUM Abstracts


Patricia A. Dailey1, Debbie Santucci1, Kyle Walsh2; 1Respiratory Care, Baystate Medical Center, Springfield, MA; 2Clinical Engineering, Baystate Medical Center, Springfield, MA

INTRODUCTION: It has been suggested that the placement of some designs of closed suction catheters in-line with the 3100B Oscillator can affect mean airway pressure and amplitude. Our objective was to determine whether this statement carried any merit. In addition we were curious as to whether there was any advantage of one type of closed suction design over another. METHOD: A 3100B Oscillator was calibrated with a flexible filtered circuit. The settings were set at Power 5.0, Frequency 5.0 Hz, Flow 30 lpm, I time 33%, and O2 40%. A size 8.0 endotracheal tube was placed in a test lung and the cuff was inflated to create a seal. The proximal pressure line was placed between the closed suction catheter and the ET tube, in order to reflect any change in mean airway pressure (MAP) or amplitude ( P) caused by the placement of the catheter in-line. Data was collected at MAP's of 30, 35 and40, first without a catheter in-line and then with the Ballard T-piece, Ballard double swivel and Airlife closed suction with Verso adaptor. In between, catheters the MAP and P were rechecked without a catheter to assure a return at baseline. RESULTS: Mean ∆ P with set MA's of 30, 35, and 40 (48.75 +/- 0.5, 47.75 +/- 2.12 and 46.5 +/-0.58 respectively). Mean MAP with set MAP's of 30, 35 and 40 (30.4 +/- 0.3, 35 +/- 0.32 and 40.1 +/- 0.15 respectively). CONCLUSIONS: The P and MAP variability between the different suction catheters was not statistically significant. However, one system (Airlife with Verso adaptor) carries the added benefit of a detachable suction catheter at the sealed adaptor (Verso adaptor) which provides the ability to change suction catheters without interrupting the ventilator circuit. Minimizing circuit disconnects prevents lung derecruitment and reduces the risk of ventilator associated pneumonia.
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